Multiple machine-tool holder.



, 11. B. CRAIG. MULTIPLE MACHINE TOOL HOLDER.

APPLICATION FILED MAY 10, 1912.

2 SEBETSr-SHEET l.

WITNESSES /NI/ENTOR Jj@ aZ/'z naz Azfomeyg l 1,061,822. PatentedMay13,1913.

L R. B. CRAIG. A MULTIPLE MAGHINE TOOL HOLDER. APPLICATION FILED MAY 1o,1912.

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ROBERT B. CRAIG, OF KANSAS CITY, MISSOURI.

v lMU'IJ'IIPIII'EI MACHINE-TOOL HOLDER.

Specicaton of Letters Patent.

Patented May 13, 1913.

Application led May 10, 1912. Serial No. 696,458.

To cZZ 'whom t may concern Be it known that I, ROBERT B. CRAIG, acitizen of the United States, residing at Kansas City, in the county ofJacksonv and State of Missouri, have invented certain new and usefulImprovements in lNIultiple Machine-Tool Holders, of which the followingis a specification.

My invention relates to tool holders adapted to receive a plurality ofdifferent tools and to support them in such relation on the carriage ofthe lathe or other similar machine, as will permit of bringing' into useany one of the tools in the holder and will insure proper and accuratepresentation of the tool in regard to the work-piece.

One object of the present invention is to have an absolutely iixedposition of thle holder and. yet to have the holder readily releasablefor its rotary movement in shifting from one tool to another.

One embodiment of my invention is illustrated in the accompanyingdrawings, in which,

Figure 1 represents a top plan view of the tool holder; Fig. 2 a frontelevation of Fig. l; Fig. 3 a vertical section along line 3-3 of Fig. l;Fig. 4, a plan section along line 4 4 of Fig. 3, looking down and Fig. 5a vertical section across one corner of the tool carrier showing theadjusting screw in detail. Y

The same reference characters refer to the same parts in the differentgures.

The tools 10,.are held in recesses 11 of the four-sided carrier 12, bymeans of set screws 13. The shape of the carrier 12 depends on whatnumber of tools are intended .to be held in the carrier, so that if,instead of four tools as here illustrated, six were to be carried', thetool carrier 12 would then be hexagonal, and so forth. The tool carrier12 has a cylin drical bore in the middle terminating at the tops with aninward annular flange 14. The carrier fits snugly around a centenpost 15which has an enlarged base 16 whereon it stands on the table of a lathe,or any other machine in use in a factory.v It carries a clamping screw17, which is free to turn therein and has a handle extending beyond thecentral part at the top. A T-shaped clamping jaw 18 threaded on thelower end of the screw 17 engages a T-slot on the lathe, whereby inturning the handle 19, the center lpart 15 is securely held on the lathetable.

The base 16 is provided with an arm 20 carrying an index or stop pin 21,which is 'so located that it will strike the fiat side of the toolcarrier 12 near the corner (see Fig. 4) and normally extends above thebottom surface of the tool carrier. On the upper side of the base plate16 and rigidlyy secured thereto is a stud 22 with a beveled top,inclined in the direction of the stop pin 21. This beveled stud 22 issituated at the same radial distance from the axis of revolution of thetool carrier 12 as four, or more, according to .the .number of tools,adjusting screws 23, which are threaded in the tool carrier 12, withscrewed-on pointed ferrules 25 of slightly larger diameter than the stud22, which ferrules are seated in chambers opening through the bottomface of the tool carrier 12, the heads of the screws 23 being accessibleat the upper side of the tool carrier. The taper of the ferrule point 25has the same angularity as the bevel of the stud 22. The relativeposition of the stud 22 and the stop pin 21 is such, that on revolvingythe tool-carrier 12 on the center-post 15, the stud 22 willintercept theferrule of one of the adjusting screws 23 at the moment when the stoppin 21 strikes the flat side of the tool-carrier 12. The stud 22 hasthen as a rule entered the fer-rule chamber. The tool carrier will thenbe held rigidly sidewise between the stop pin 21 and the beveled stud22. To retain the screws 23 in a given position, a spring 26 is insertedin the chamber pro-vided for it in the tool-carrier 12, acting between ashoulder on the ferrule 25 and one` `are held in position by said rim.In a lcarrier, when center-post 15 are provided grooves 31 for thesewedges and each groove has an inner tapered wall corresponding with thetaper of the wedge. In pushing the block and the wedges downward, thewedges will then be made to grip between said tapered wall and the innercylindrical surface of the toolcarrier 12. The shoulders at the top ofthe wedges will limit the upward movement of the block and wedges,relative to the tool impinging with the annular Hange 14 of thetool-carrier 12. A spring 29 is inserted between the top of thetool-carrier and the shoulder of the head 27 around its narrow lowershank. At its upper end, the block 27 is provided with a transversesleeve 32 in which is carried the crank shaft 33 with an inwardlyprojecting crank pin 35. At its outer end, the crank shaft has a handle34 and the shaft is held in position in the sleeve 32 by the pin 36working in the slot 37. The length of the slot is selected so as to givea revolving movement of 180O of the crank shaft. The center-post 15 hasa longitudinal bore wherein said crank pin 35 operates and the boreforming a chamber for a piston 39 with piston head 40. The pitman 3Sconnects crank pin 35 with the piston 39 and a spring 42 is inserted inthe chamber and exerts pressure between the head 40 and a shoulder inthe chamber, always drawing the piston head downward. The chamber isclosed up at the bottom by a cover-plate 43, and the piston rests onthis cover-plate in one of its extreme positions. With the piston andcrank shaft in this last named position, the spring 29 is free toexpand, thereby raising block 27 and withdrawing the wedges 30 from thegripping position between the center-post l5 and the tool-carrier 12until the upper ends of the wedges impinge the flange 14 in the carrier.As the spring 29 is now restricted from further expansion, the toolcarrier 12 and the block 27 constitute a solid body. The piston 40,coming in contact with the pla-te 43 after a turn of about 30o of thehandle 34, and the parts 12 and 27 now acting as one, the last part ofthe turn of the handle will slightly raise the tool-carrier 12 and theblock 27, using the crank pin 35 as fulcrum. The tool-carrier will thenbe free to revolve on the center-post, passing above the stop pin 21,and another tool may therefore be swung in position for action, beingproperly located, as already described, by one of the screws 23, thedowel pin 22 and a stop pin 21, on turning back the handle 34. The crankshaft will then again operate the piston 40 against `the spring 42,thereby lowering the block 27 and compressing spring 29 simultaneouslydriving the wedges 30 tightly in between the acting surfaces of thecenter-post and the tool-carrier.

Beside locating the tool carrier and the tools in the proper lateralposition, the screws and ferrules 23, 25, also serve to accuratelylocate each tool separately relatively to the work piece. This isaccomplished by turning the screws 23, and the variation in the heightof the tool will then directly correspond to the distance the ferrule 25is away from the bottom of the tool carrier 12.

Revolving the handle 34 one half of a revolution, the operatio-ns are asfollows: The crank pin 35 moves down, taking parts 33, 39, 40 with it,until piston 40 rests on plate 43, 42 being allowed to expand. At thispoint, crank pin 35 ceases to move down and block 27 and keys 30 beginto move upward. The keys are first pulled from their wedging position,second, impinge flange 14, and third, elevate carrier 12 above pins 21,22 by means of the lifting action of the crank pin 35 during the lastpart of the turning of handle 34, leaving carrier 12 free to revolve.After turning carrier 12 until a new tool is presented to the work, thehandle 34 is returned to the starting point. 1n this move, block 27,spring 29, keys 30 and carrier 12 all descend until one of the ferrules25 comes in contact with stud 22, at which point carrier 12 stops, andparts 27 and 30 continue to move down, t-he spring 29 being compressedand bearing down on the too-l carrier 12. As the keys 30 come to theirwedging position, piston 40 leaves plate 43, and spring 42 iscompressed. The object of spring 42 is to compensate for wear on keys 30and to allow pin 35 to pass the center.

1 claim:-

1. A multiple machine toolholder having a central post by means of whichthe holder is secured on a machine, a revolving toolcarrier seated onsaid post provided with an equal number of straight sides as the numberof tools, and means for axially clamping said tool-carrier to said post;an automatic device for positive lateral adjustment between said toolcarrier and post in a plurality of predetermined positions, saidadjusting device comprising a stop pin situated on said central post andat such a distance from its axis that it will impinge any one of saidstraight sides of the tool- Carriermear the extreme point thereof.

2. A multiple machine tool-holder having a central post by means ofwhich the holder is secured on a machine, a revolving toolcarrier seatedon said post provided with an equal number of straight sides as thenumherof tools, and means for axially clamping said tool-carrier to saidpost; an automatic device for positive lateral adjustment between saidtool carrier and post in a plurality of predetermined positions, saidadjusting device comprising a stop pin situated on said central post andat such a distance from its axis that itwill impinge any one of saidstraight sides of the tool-carrier near the extreme point thereof, atapered point for each of said tools on said tool-carrier situatedequi-distant from the axis of the holder, and a stud on the centralpost, said stud having a beveled face located in the path of the taperedpoints on rotating said tool-carrier.

3. A multiple machinetool-holder having a central post by means 0f whichthe holdeil is secured on a machine, a revolving toolcarrier seated onsaid post provided with an equal number of straight sides as the numberof tools, and means for axially clamping said tool-carrier to said post;an automatic device for positive lateral adjustment between said toolcarrier and post in a plurality of predetermined positions, saidadjust-ing device comprising a stop pin situated on said central postand at such a distance from its axis that it will impinge any one ofsaid straight sides of the tool-carrier near the extreme point thereof,and an adjusting screw with a tapered point for each of said tools onsaid tool-carrier situated equi-distant from the axis of thel holder,and a stud on'the central post, said stud having a beveled face locatedin the path of the tapered points on rotating said toolcarrier.

et. A multiple machine tool-holder having a central post by means ofwhich the holder is secured on a machine, a revolving toolcarrier seatedon said post provided .with an equal number of straight sides as thenumber of tools, and means for axially clamping said too-l-carrier tosaid post; an automatic device for positive lateral adjustment betweensaid tool carrier and post in a plurality of predetermined positions,said adjusting device comprising a stop pin situated on said centralpost and at such a distance from its axis that it will impinge any oneof said straight sides of the tool-carrier near the extreme pointthereof, and an adjusting screw with a tapered point for each of saidtools on said tool-carrier situated equi-distant from the axis of theholder, and a stud on the central post, said stud having a beveled facelocated in the path of the tapered points on rotating said tool-carrier;said adjusting screw being provided with a frictional spring forretaining the adjusting screw in any given position.

5. A multiple machine tool-holder having a central post by means ofwhich the holder is secured on a machine, a revolving toolcarrier seatedon said post provided with an equal number of straight sides as thenumber of tools, and means for axially clamping said tool-carrier tosaid post; an automatic device for positive lateral adjustment betweensaid tool carrier and post in a plurality of .predetermined positions,said adjusting device comprising a stop pin situated on said centralpost and at such a distance from its axis that it will impinge any oneof said straight sides of the tool-carrier near i the extreme pointthereof, and an adjusting screw with a tapered point for each of saidtools on said tool-carrier situated equi-distant from the axis of theholder, and a stud on the central post, said stud having a beveled facelocated in the path of the tapered points on rotating said'tool-carrier,whereby said tool-carrier will tend to rotate in one direction actuatedby said bevel face and tapered points.

6. A multiple machine tool-holder having a central postby means of.which the holder is secured on a machine, a revolving toolcarrierseated on said post provided with an equal number of straight sides asthe number of tools, and means for axially clamping said tool-carrier tosaid post; an automatic device for positive lateral adjustment betweensaid tool carrier and post in a plurality of predetermined positions,said adjusting device comprising a stop pin situated on said centralpost and at such a distance from its axis that it will impinge any oneof said straight sides of the toolcarrier near the extreme pointthereof, and an adjust-ing screw with a tapered point for each of saidtools on said tool-carrier situated equi-distant from the axis of theholder, and a stud on the central post, said stud having a beveled facelocated in the path of the tapered points on rotating said tool-carrier,said bevel faced stud in cooperation with any one of said taper pointedscrews, said stop pin and' one or the other of said straight sides onthe tool carrier positively holding said tool carrier in any one of aplurality of predetermined positions.

7. In a multiple machine too-l-holder having a central post by means o-fwhich the holder is secured on a machine, a revolving tool-carrierseated on said post provided with an equal number of straight sides asthe number of tools, and means for axially clamping said tool-carrier tosaid post; the combination with an automatic device for positive lateraladjustment between said tool carrier and post in a plurality ofpredetermined posit-ions, said adjusting device comprising a stop pinsituated on said central post and at such a distance from its axis thatit will impinge any oneof said straight sides 'of the tool-carrier nearthe extreme point thereof,and an adjusting screw with a taperedpoint foreach of said tools on said tool-carrier situated equi-distant from thevertical adjustment relative to the Work axis of the holder, and a studon the central piece. 10 post, said stud having al beveled face locatedThe foregoing specification signed this in the path of the taperedpoints on rotating 22nd day of April, 1902.

said tool-carrier; a frictional spring for re- ROBERT B. CRAIG. tainingsaid adjusting screw in any' given In presence of position; the settingof each individual ad- BENJ. L. SIMPSON,

justing screw giving to each tool its proper EDWARD FARLEY.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of latelts, Washington, D. C.

